kit building

Looking Into the Crystal Ball

JOE EISENBERG

The Discovery Crystal Radio My project doing beta building of the big T41 SDT kit is still under way, but I am waiting on some parts. So, I thought this would be a good time to look at a new take on an old favorite. I think most hams my age started their kit building years ago with a simple crystal set. Crystal sets date back over 100 years to the earliest days of radio. The principle that defines a crystal radio is its ability to receive AM signals using only the RF energy present in the air, without amplification or the need for a power supply. When we measure signal strength present at the antenna input to a receiver, it is often measured in millivolts or microvolts. After all,…

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CQ Amateur Radio (Digital) - 1 Issue, January 2023

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